Ildefons Cerdà

He was born in Centella, Osona, Barcelona, on his family’s estate, Más Cerdá de la Garga. He was the fourth of six siblings, and his family’s roots have been documented in the Vic land registry since 1440. His family, with a liberal tradition and rural ancestry, derived its income from trade with the Americas.

In 1832, he moved to Barcelona to study mathematics, architecture, and navigation at the Escuela de la Llotja, after refusing to pursue the ecclesiastical studies his father had intended for him in Vic; however, he did not obtain his degree in architecture, so in 1835 he moved to Madrid to study at the School of Civil Engineering. After enduring many financial hardships due to a lack of support from his family, he earned his engineering degree in 1841 and worked as a state engineer at the Public Works Office between 1839 and 1849, serving in posts in Murcia, Valencia, Teruel, Tarragona, Girona, and finally Barcelona, where he collaborated on the construction of Spain’s first railroad, the Barcelona–Mataró line.

I prepare statistical summaries for different types of housing—including both single-family homes and multi-family dwellings—and for different socioeconomic groups.

Upon the death of his father and his two older brothers, he inherited a substantial fortune, which allowed him to enter politics in 1849 so that, through his profession, he could “urbanize” society, as he himself stated. On the economic front, Cerdá established the standards for infrastructure, property division, and the allocation of land parcels in the new Barcelona.

The previous year, in 1848, he had married the painter Magdalena Clotilde Bosch Calmell, daughter of the banker Josep Bosch Mustich, with whom he had four daughters; it was rumored in the social circles of his time that the youngest was not Cerdá’s daughter, but he acknowledged her as his own, but ongoing marital problems led to the couple’s separation in 1862.

His most important and internationally recognized work is his urban expansion plan for the city of Barcelona, “The Cerdá Plan.” Its inception and subsequent approval in 1859 were surrounded by controversy due to the Spanish government’s insistence that engineer Cerdá be the one to carry out the urban development project rather than other renowned architects of the time; In addition to opposition from the city council, it also clashed with the vision of the Catalan bourgeoisie, who looked to Paris or Washington as models for the layout of the new city, with a more distinctive architectural style.

Cerdá’s original grid plan called for streets 20, 30, and 60 meters wide. The city blocks had buildings on only two of their four sides, resulting in a population density of 800,000 people. Under its original design, the Eixample would have been fully occupied by 1900, although speculative development subsequently led to a significant increase in density.

Cerdá advocated rationalism and a balance between urban values and rural benefits.The plan classified the territory for the first time into “vías” (ways)—spaces for mobility, service networks such as sanitation, gas, water, trees, street lighting, street furniture, etc.—and “intervias” (blocks, islands, and city blocks) which are spaces for private life where buildings are arranged in rows around an interior courtyard through which all dwellings receive adequate ventilation and natural sunlight, as recommended by the hygiene movements, thereby standardizing living conditions for all social classes.

The city’s new urban layout incorporated the “house block,” a concept entirely unique compared to other European cities, designed as a square grid measuring 113.33 meters on each side, with the final design featuring 45-degree chamfers. Cerdá designed the “Unlimited Ensanche,” a regular grid extending across the entire urban layout, incorporating green spaces and public services within it.

Not only did he have an egalitarian and scientific vision in his approach to public health, but he also foresaw unlimited growth due to its mathematical and geometric nature, defining an unusually wide street layout, to avoid the overcrowding that characterized city life at that time, anticipating the conflicts related to motorized traffic that would arise 30 years later.

Each neighborhood had an area designated for public buildings. I incorporated the layout of the railroad lines to improve access to the city, keeping in mind that they would eventually be moved underground.

Ildefonso Cerdá developed a genuine sociological study as an appendix to his “General Theory of Urbanization,” which sought to address the problems of population concentration in cities and industrial development. In this treatise, he presented theories he had already applied in the Project for the Internal Reform and Expansion of Barcelona, including an assessment of social inequalities in the health of the working classes, comparing differences in life expectancy based on social status.

In “Four Words on the Ensanche” (1861), he developed the first compensation system and land redistribution technique as a means to ensure a fair distribution of the benefits and costs of the urban development plan, to reconcile the interests of property owners with the need for land in a proportionate manner, allowing construction in proportion to the plot of land contributed. This system would be included in the Posada Herrera Bill, which would be pioneering legislation in Europe for both Madrid and Barcelona and which, a century later, would also be incorporated into the 1956 Land Law.

Cerdá endured an exhausting personal smear campaign based on rumors and lies, with claims even circulating that “he was not Catalan.” The institutions also snubbed him, as the creation of such a project would have meant naming a main street after him—an offer that was never even considered—and Mayor Francesc Rius denied him a monument that had already been designed in 1889 by Pere Falqués.

He died in 1876, ill and nearly bankrupt because the government had not paid him for his work, at the Caldas de Besaya spa in Cantabria.

The obituary was published in the newspaper “La Imprenta”

“Mr. Cerdá was a liberal and a talented man—two qualities that, in Spain, can be a liability and often lead to many enemies…”

In 1960, a square—Plaza Cerdá—was named after him. Located outside the Eixample district, it is remembered for its constant flooding problems due to poor drainage, which had also been one of Ildefonso Cerdá’s greatest concerns. In 1971, his remains were transferred to the new Montjuïc Cemetery, coinciding with the reprinting of his *General Theory of Urbanization*.